anthrax3 / transit-cljs

Transit for ClojureScript

transit-cljs

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from ClojureScript. Unlike the Java and Clojure implementations it relies on the non-streaming JSON parsing mechanism of the host JavaScript environment.

• Rationale
• API docs
• Specification
• Getting Started

This implementation's major.minor version number corresponds to the version of the Transit specification it supports.

NOTE: Transit is a work in progress and may evolve based on feedback. As a result, while Transit is a great option for transferring data between applications, it should not yet be used for storing data durably over time. This recommendation will change when the specification is complete.

Releases and Dependency Information

• Latest release: 0.8.256
• All Released Versions

Leiningen

Add the following to your project.clj :dependencies:

[com.cognitect/transit-cljs "0.8.256"]

Maven

Maven dependency information:

<dependency>
  <groupId>com.cognitect</groupId>
  <artifactId>transit-cljs</artifactId>
  <version>0.8.256</version>
</dependency>

Usage

(ns example
  (:require [cognitect.transit :as t]))

(defn roundtrip [x]
  (let [w (t/writer :json)
        r (t/reader :json)]
    (t/read r (t/write w x))))

(defn test-roundtrip []
  (let [list1 [:red :green :blue]
        list2 [:apple :pear :grape]
        data  {(t/integer 1) list1
               (t/integer 2) list2}
        data' (roundtrip data)]
    (assert (= data data'))))

Default Type Mapping

Abbreviations:

• cc = cljs.core
• gm = goog.math
• cct = com.cognitect.transit

Transit type	Write accepts	Read returns
null	null	null
string	String	String
boolean	Boolean	Boolean
integer	Number, gm.Long	Number, gm.Long
decimal	Number	Number
keyword	cc.Keyword	cc.Keyword
symbol	cc.Symbol	cc.Symbol
big integer	cct.BigInteger	cct.BigInteger
big decimal	cct.BigDecimal	cct.BigDecimal
time	Date	Date
uri	cct.URI	cct.URI
uuid	cct.UUID	cct.UUID
char	String	String
array	cc.IVector	cc.IVector
list	cc.IList	cc.IList
set	cc.ISet	cc.ISet
map	cc.IMap	cc.IMap
link	cct.Link	cct.Link
cmap	cct.IMap	cct.IMap

Contributing

This library is open source, developed internally by Cognitect. We welcome discussions of potential problems and enhancement suggestions on the transit-format mailing list. Issues can be filed using GitHub issues for this project. Because transit is incorporated into products and client projects, we prefer to do development internally and are not accepting pull requests or patches.

Development

Dependencies

Install dependencies with

lein deps

Running the tests & benchmarks

Running the tests:

lein cljsbuild once test

In order to run the transit-format bin/verify you must first clone transit-format into the same parent directory as your transit-cljs checkout and build the roundtrip file:

lein cljsbuild once roundtrip

To run the benchmarks you must first clone transit-format into the same parent directory as your transit-cljs checkout.

Running the benchmarks:

lein cljsbuild once bench
node target/transit.bench.js

Build

Build JAR for ClojureScript

Assuming you have a JDK and Maven installed, the following will install a JAR suitable for use from ClojureScript into your local Maven repository.

build/package_local

Copyright and License

Copyright © 2014 Cognitect

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.